/* SPDX-License-Identifier: GPL-2.0-only */ #include <device/device.h> #include <stddef.h> struct pick_largest_state { struct resource *last; const struct device *result_dev; struct resource *result; int seen_last; }; static void pick_largest_resource(void *gp, struct device *dev, struct resource *resource) { struct pick_largest_state *state = gp; struct resource *last; last = state->last; /* Be certain to pick the successor to last. */ if (resource == last) { state->seen_last = 1; return; } if (resource->flags & IORESOURCE_FIXED) return; /* Skip it. */ if (last && ((last->align < resource->align) || ((last->align == resource->align) && (last->size < resource->size)) || ((last->align == resource->align) && (last->size == resource->size) && (!state->seen_last)))) { return; } if (!state->result || (state->result->align < resource->align) || ((state->result->align == resource->align) && (state->result->size < resource->size))) { state->result_dev = dev; state->result = resource; } } const struct device *largest_resource(struct bus *bus, struct resource **result_res, unsigned long type_mask, unsigned long type) { struct pick_largest_state state; state.last = *result_res; state.result_dev = NULL; state.result = NULL; state.seen_last = 0; search_bus_resources(bus, type_mask, type, pick_largest_resource, &state); *result_res = state.result; return state.result_dev; }